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Boaz Brickner
b88b53e7e3
This supports importing globals in the global scope and within
namespaces, and support for class static data members.
C++ Interop Demo:
```c++
// my_global.h
extern int my_global;
void inc_my_global();
```
```c++
// my_global.cpp
#include "my_global.h"
int my_global = 5;
void inc_my_global() {
++my_global;
}
```
```carbon
// main.carbon
library "Main";
import Core library "io";
import Cpp library "my_global.h";
fn Run() -> i32 {
Core.Print(Cpp.my_global);
Cpp.inc_my_global();
Core.Print(Cpp.my_global);
return 0;
}
```
```shell
$ clang -c my_global.cpp
$ bazel-bin/toolchain/carbon compile main.carbon
$ bazel-bin/toolchain/carbon link my_global.o main.o --output=demo
$ ./demo
5
6
```
Part of #6006.